Add dump command

Change-Id: If38d01ebb8788090f91a76daf6b7fc9add0320b7
diff --git a/src/yang_access.hpp b/src/yang_access.hpp
index 9b8a443..7fa562c 100644
--- a/src/yang_access.hpp
+++ b/src/yang_access.hpp
@@ -35,8 +35,7 @@
     std::shared_ptr<Schema> schema() override;
 
     void enableFeature(const std::string& module, const std::string& feature);
-    std::string dumpXML() const;
-    std::string dumpJSON() const;
+    std::string dump(const DataFormat format) const override;
 
     void addSchemaFile(const std::string& path);
     void addSchemaDir(const std::string& path);